leading zero number formatting

[RedSkeleton007]

Hi, I want to print out lock combination guesses, all as 4 digits with leading zeros as needed (0000, 0001, 0002, etc.), but I'm having trouble:

#!/usr/bin/env python3
#MoreOnLoops.py

#pad lock guesser
lockCombo = 1000
guess = 0000
while guess != lockCombo:
    guess += 1
    if guess == lockCombo:
        print("After " + str(guess) + " guesses, the correct combo is " + str(guess))
        break
    else:
        print("{:02d}".format(guess))
        #print(str(guess) + " is not the correct combo. Trying next guess.")
        continue

Also, why is 100 not included in the output of the following loop:

for i in range(5, 100, 5):#start at 5, go up to 100 with increments of 5
    print(i)

Output:
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95